Add 81/72 and 20/98
1st number: 1 9/72, 2nd number: 20/98
81/72 + 20/98 is 521/392.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 98 is 3528
Next, find the equivalent fraction of both fractional numbers with denominator 3528 - For the 1st fraction, since 72 × 49 = 3528,
81/72 = 81 × 49/72 × 49 = 3969/3528 - Likewise, for the 2nd fraction, since 98 × 36 = 3528,
20/98 = 20 × 36/98 × 36 = 720/3528 - Add the two like fractions:
3969/3528 + 720/3528 = 3969 + 720/3528 = 4689/3528 - 4689/3528 simplified gives 521/392
- So, 81/72 + 20/98 = 521/392
In mixed form: 1129/392
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/72+40/98 81/72+60/98